stuartph

Tommi

996.362.140.04 is the part number for the 10"x18" ET65 wheels to match the ones in your avatar

Vilhuer

http://928gt.com/ps-25888-144-928-cup-racer-set.aspx

IIRR those are ET68. I just don't get it how those would fit and be able to turn to full lock without any mods like adding another stop to steering rack ends. If ET is correct, it extends 11mm more towards outside and 27mm towards inside compared to 8" ET60 CS front wheel.

10" ET65 extends +20mm towards outside and +30mm towards inside compared to 8" ET60. Thats one hell of the feat to make those fit with proper size (275 or larger) rubber. 8" ET64 with 245 is close enough already that I just don't see it happen without very large hammer.

Best local Porsche body shop tried to roll 928 front fenders but their machine just pulled almost entire fender off from body instead of rolling the lip. If they had kept on fender would have cracked from lower rear corner mounting point.

These any 10" will fit to front and fenders are easy to roll without problems sound like similar stories like running some oil brand will stop engine from exploding. Mark K. can do it but I bet others will have problems.

hacker-pschorr

I just ground the lips off my 79, they were already in the body shop to be re-painted.

FBIII

Wouldn't grinding off the lip, take away the fenders stiffness?

hacker-pschorr

The lip didn't do much to protect the fender form improperly installed wheels / tires from the previous owner so I didn't really care at that point.

Fikse Wheels

We do make 10x18" wide wheels in a 64mm offset. I have attached a couple pictures with Fikse wheels on a 928 for your consideration.

stuartph

Alan

Could you tell me how heavy your 10 x18 and 11x 18 wheels are please

Vilhuer

How large ET you can do to 8x18 and 8.5x18 wheels?

tommi nylund

So, if following the 928 Specialist's "cup racer set" my idea of 265's at front and now I have 275/35 at rear would be very fine.

My friend is running 275's at front and 335's rear in his SC'd Viper and that looks and performs quite purposefully. But I think he will need that big tires at rear because lacking weight (and having a lot of power) which I have (and haven't) in 928?

I don't know how Mark can do things which no one else can't, but I think here are others too who have had 10" front wheels without problems and written about it in this thread.... And if I can find a pair of those wheels, which part number stuartph kindly posted, I will try and see if they fit 928 in Finland also, if not maybe I have to pay a visit to USA then to make them fit...?

Fred, yes we like to go sideways in Finland, but if I would want only that I would drive a Nissan or something...although I would drive only 4wd Nissan if I would ever get one. And for 1000lakes & other rally things I have a lovely Italian car in my garage which dominated those races consecutively for few years during 80's/90's.

hacker-pschorr

I have 6 of them in storage.....replica's, same specs....

Check eBay, they are usually all over there.

F451

Yes, they are a fairly common size, mine came off a 2000 Porsche 996 C4.

Rear: 18 x 10 ET65 (993.362.140.04)

mark kibort

You have to understand what you are doing and what you are dealing with.

as far as wheels go. Ive replicated the wheel set up, originally set up by Devek to make wheels that fit best up front. THE BEST without question is a 9.5" front wheel with 8" backspacing or a 10" rim with 8.5" backspacing. (that wheel goes inward, and doesnt change the outward position. Alan at Fiske now, helped me with building these rims. Ive done this on 4 other 928s, all with the exact same fit! It works, because the fit is simple geometry and all porsches 928s are near the same

as far as rolling. How many times have I said, "lose the rolling machine" it doesnt compare to what is needed with the aluminum fender. I wouldnt even try it, as it WILL not work as well as what the wood baseball bat will do. dont take my word for it. heck, even ask Richard who came over from the coast to have me do his fenders for him. you dont need to cut of the lip, although on the holbert car, it rubbed a little for so long with the 305s up front that it wore the metal away and i ended up pealing off the lip that was bent inward after it was worn away. (for a small 4" section) . anyway, when its rolled properly, its way out of the way and near flush with the inside of the fender well.

scots car with 9.5" rims, 8" backspacing 275 tires, 18 " rims, no rubbing and lots of clearance.

Vilhuer

Trust me, I understand ET etc wheel tech including 928 suspension setup better than most. Can you turn them to full lock without any rubbing on inside? If not, there is one issue already which needs to be addressed if one wants it to work like factory intended. I quess you don't run into very tight corners.

Lets keep CS 8" ET60 as baseline since its definitelly known to work. 9.5" ET83 (= 8" backspacing) is -4mm outside and +42mm inside compared to CS setup, 10" ET89 (= 8.5" backspacing) is -4mm and +54mm inside if I calculated correctly. I can see how these will work on straight line as long as they don't hit spring already before they are fully mounted in. Extra width is all towards inside so handling will not be affected in any way. Handling problems can come when wheels centerline moves too far towards outside. In "S4" suspension I believe this number is +10mm and in older setup +16mm compared to stock.

10" ET64 is totally different thing than your setup as its 25mm (full 1") further out. There is 4mm more space on outside in your setups than factory '89 GT but this 10" ET64 is basically same thing as using 8" ET39 at front when only outside is considered. Well, narrow for 10" wheel 265 rubber might buy some room but it sure extends way out compared to any factory style setup or even practically every aftermarket setup anyone is running. I believe Tommi is currently using 8" ET50. There is long way from it to ET39, even with baseball bat.

dprantl

I really don't understand how people are getting 10" ET65 wheels to fit. I tried that on the front of my '86 way back and it stuck past the fenders and looked silly. Enough suspension compression and my fenders would be toast.

If someone is going to claim that some such wheels work on the front of the 928, they must work with stock suspension (older and slightly sagging), stock front fenders and a typical 928 ride height, which is usually ~20% less than factory, full lock to lock turns and very hard sharp fast corners. Race 928's that don't do full-lock don't count. Hypercoil springs don't count, etc, etc.

Dan
'91 928GT S/C 475hp/460lb.ft

hacker-pschorr

Sure they count, since there are plenty of people with similar setups.

That's why this is a discussion forum. We discuss different setups

I could care less if I get full lock with my 928's, I don't want to drive around with the bicycle tires the factory sent the car with.

Here is Rick's car with et65 10" front wheels & 265 Hoosiers:



Was your car an 86 or 86.5? There is a difference.